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19,826
RESULTS

Media Type
14
collections
18,719
texts
710
movies
166
audio
166
education
33
images
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Topics & Subjects
4,675
ERIC Archive
2,919
Social sciences
2,484
Sciences
2,061
NASA Technical Reports Server (NTRS)
2,020
Social Sciences
1,360
DTIC Archive
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Collection
4,671
Education Resources Information Center (ERIC) Archive
3,247
American Libraries
2,636
Universal Library
2,417
Canadian Libraries
2,061
NASA Network Resource and Training Site
1,360
Defense Technical Information Archive
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Creator
4,675
eric
2,061
nasa technical reports server (ntrs)
1,360
defense technical information center
371
alberta. alberta education
307
rbtv
264
académie des sciences (france)
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Language
16,568
English
1,709
French
644
German
46
undetermined
40
Czech
40
Latin
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